I'd get a lawyer. Did your boss lay you off indefinitely, or just till your healed up? If he laid you off permanently, you can sue him for damages for him illegally firing you (he'd be trying to shove you under the table so he doesn't have to pay for your injuries). If it's only temporary you most likely still qualify for some kind of workmans comp pay while you heal.
My ex-fiance's brother went through this same kind of b-s. He was working as a groundskeeper for an apartment complex and fell on a nail sticking up in the floor while he was re-carpeting an apartment and it stabbed him through his knee behind his kneecap. They fired him and told him he was responsible for his own doctor fees because of 'self neglegence'. The dude got a lawyer and sued. They ended up having to pay him 15k in damages and all of his surgery bills cause he had to have a pin put in. I think they also had to reimburse him for rent because part of his employment also included living on the premesis of the apartment and they kicked him out, but that's circumstantial.
They can't pull that crap about not going to their preffered doctor though, that's why your allowed to get a second opinion.
